{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xb135e87275938c59cfdad85ea7c13184df671e676e5b0cdfd84f143dd130f8a8",
    "signature": "0x33116e899c0cc4f2267e1481eb9af7f4c64c971e28500b5c977f47f44bb44e3350b94c10024f6f420d645c97ade95bca5bafe4571a10b9d3c6e25b65d419ab5f1c",
    "signer": "0x1ff2ec786297b22C00200f465f601b4b7eeEe17d",
    "userId": "930672817"
  }
}